Two-cycle rotary motor.



No. 706,730. Patented Aug. I2, |902. P. A. DUPONT. n TWO CYCLE ROTARY MOTOB.

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UNITED STATES l PATENT OFFICE.

PAUL ALEXANDRE DUPONT, OF ROUEN, FRANCE.

TWO-CYCLE ROTARY MOTOR.

SPECIFICATION forming part of Letters Patent N o. 706,780, dated August 12, 1902.

l Application tiled February 17,1902. Serial No. 94,532. (No model.)

To all whom t may concern.'

Beit known that I, PAUL ALEXANDRE DU- PONT, a citizen of the French- Republic, and a resident of Rouen, France, have invented certain new and useful Improvements in Two- Cycle Rotary Motors, ofwhich the following is a specification. l

The present inventionrelates to a two-cycle rotary motor, the object of which is to impart to the driving-shaft direct rotary motion, at the same time retaining the economical advantages of cylinder-engines due to the circumstances of distribution of the elastic fluid which supplies the motive power.

The annexed drawings illustrate a form of construction, Figure 1 being a longitudinal section of the motor on line E F of Fig. 2. Fig. 2 is a section on line A B CAD of Fig. l. Fig. 3 is an elevation of the front cover of the cylinder of the motor, illustrating a means Whereby the distribution of steam is effected. Fig. 4C is a view the upper half of which represents a sectional view of the front cover Aand the lower portion a half-section of the rotary motor illustrated by Figs.V 1 to -t and provided with trip-valve gear.

The motor comprises the4 following elements: first, a hollow cylinder 1, closed at both ends and divided into'equal sectors byv` radial planes; second, a shaft 2, independent of the cylinder, traversingit along its center line and provided withas many vanes as thereare radial planes in the cylinder, the same being arranged at equal intervals on its circumference.

In the annexed drawings the cylinder 1 has two radial partitions 3 and 4,and'consequently shaft 2 has two vanes 5 and 6. The Vanes bear against the interior surface of the cylinder, so as to make a tight joint. case as regards the edges of the radial partitions of the cylinder where they are in contact with shaft 2. Each vane therefore represents piston moving within a chamber formed by the portion of the cylinder 1contained between two radial partitions. The shaft and .the cylinder are free toqrevolve independently of each other on'their commonaxis. The cylinder is j oined'by the parts 7 andS in the form of truncated concs tosmaller cylinders 9 10, arranged in the same axis, forming journals. These journals, .as Wellas those of the shaft,

This is also the are supported by bearin gs fitted with stuffingboxes,as will be hereinafter further explained.l

The cylinder 1 and a fly-wheel 11, keyed to shaft 2, are each surrounded by Dobo rings 12 or any other kind of mechanical or electric coupling permitting them to revolve in one direction only. Each of the two revolving organs (the cylinder and the fly-Wheel on the shaft) is provided with two coupling or clutch rings of this kind, acting in opposite directions to each other-and thrown into and out of gear at will.

The'motive fluid coming from the boiler or generating apparatus enters a box '18, made in one piece withthe bearings or plumberblocks of the shaft and of the revolving cylinder. This box is .composed of two parts, one cast solid with the lower part of the bearings or plumber-blocks and their common frame or standard` 14C, the other cast in one piece with the cap-pieces of the bearings 47. 'Stuffing-boxes prevent leakage between the bearings and journals. Any system of bearing-blocks with stufng-box combined or of separate bearings and stuffing-boxes is applicable for this part, which has nothing to do with the distinctive features of the engines here inv question. The motive fluid enters the box 13 and passes through the annular space 15, surrounding the driving-shaft, into the conicfrustum-shaped cap 7 of the cylinder, thence entering the cylinder, or rather its various compartments,) being admitted through its bottom by distributing appliances of any suitable kind. Figs. 1 to 3 of the annexed drawings show, by way of example, a system off distribution by a slide-valve. The admission-ports 16 in the upper part of one compartment and 17in the lower part of the adjoining compartment are placed in the vfo'rmof sectors in proximity to the partition separating the two compartments. The terms upper and lower part used here are only means to signify that the ports in question act in opposite directions, like the vupper and lower ports of the slide-'valve of a cylinder-engine. The exhaust-portlS is arranged in the partition separating the two compartments of the cylinder. lt is therefore located between the two admission-ports described above. The 'slide-valve 19 itself is in the IOO form of a truncated sector, having the same center of curvature as the sectors forming the ports. It moves on an axis 20, situated on this center. (See Fig. 3.) Its movement is obtained by means of a grooved eccentric 21, keyed to the shaft, its groove 22 (indicated by dotted lines'in Fig. 3) being in the form of a closed endless curve. This groove serves as the guide for the roller 23, arranged at the end of a bell-crank 24, the other end of which carries the slide-valve 19, above referred to. The conformation of the curve formed by the groove determines the conditions of distribution of the motive liiuid. A suitable design of the sides of this groove at the extreme point insures the passing of the roller 23 from 'one branch of the curve to the other. The motive fluid on issuing through the exhaustport passes within the partition along the whole length of the cylinder, issuing through the other cylinder-cover into the cap 8, similar in shape to that previously described and in which the cylinder terminates at this end, and passes thence into a box 25, (similar to the admission-box,) from which it escapes and which at the'same time forms a bearing and stuffing-box for the revolving cylinder. If the engine is compound or multiple-expanding, the box 25 is closed and receives symmetrically with cylinder 10 the end on the admission side of a cylinder similar to the first, but of'larger volume, the increase of volume being obtained either by increasing the diameter or by increasing the length of the cylinder. Shaft 2 is in this case extended through 10 up to this last cylinder. Being thus constituted, the motor is capable of turning in either direction as the couplings on the cylinder and on the shaft are thrown into gear, these permitting revolution only in the desired direction. Power may be transmitted either by means of the cylinder or by means of the shaft, preferably by the first. Its bulk (which is necessarily considerable) acts in this case as a kind of fly-wheel.

The action is as follows: Supposing the motor to be at the point of starting, the load being made to bear on the cylinder, and the direction of the revolution being chosen as indicated by the arrow, Fig. 2, the motive fluid admitted through 26 and 27 will propel the vanes 5 and 6 in the direction indicated by the arrow, as the partitions 3 and 4 cannot move in the opposite direction in consequence of the action of the coupling-ring fitted to the cylinder. When the vane 5 has been brought face to face with partition 4 and vane 6 with partition 3, admission will take place through 28 and 29. As the vanes cannot move backward on account of the action of the coupling arrangement iitted to the iiy-wheel, the motive fluid will propel the radial partitions 4 and 3 in the direction indicated by the arrow, and consequently will cause the cylinder to revolve, while at the same time the iiuid which has acted in the preceding phase is exhausted, being expelled by the two particoarse tions. The same process is reenacted in consequence of the action of the distribution arrangement, so that the cylinder and shaft will soon be in a state of continuous motion. The system is also suited for the application of a method of distribution with abrupt movements on the trip-valve system. The motive fluid is introduced through shaft 30, which is hollow and pierced with holes 31 32 at the base of the paddles, Fig. 4. Within this shaft there revolves a cylindrical box 33, provided with longitudinal slots 34, which may be brought opposite the orifices in the shaft. This box is controlled, guided by two symmetrical stems 34a, issuing from the shaft Vthroiugh slots 35, arranged in its vertical section in the part situated outside the cylinder. From the edge of each slot there arises a rod or stem 36 of one piece with the shaft and which carries a pivot 37, the center line of which is parallel to` -that of the' shaft. On this pivot turns a bell-crank lever 33, which controls the corresponding stem of the box 33 by means of a fork 39, into which a pin 40, fixed to the stem of the box 33, catches. The upper arm of the bell-crank lever is kept by a spring 41 in such a position that the stem of the fork and the stem of the box are parallel, in which position all the orifices in the shaft are closed, as shown in Fig. 4in the annexed drawings. If the forks are shifted from this intermediate position first in one direction and then in the other, it will be seen that the admission-ports for the motive iuid are successively opened in both directions. The revolution of the fork is caused by drivers 42, mounted on the pivot 43 on the cylinderbottom and which are held in one direction by a fixed catch 43 and in the other direction by a spring 44. .When the cylinder revolves on the shaft, one of the levers pressing on the projection of the corresponding fork causes it to revolve. When the rotation of the cylinder takes place in the opposite direction, this lever shifts aside, so that it passes over the projection of the fork without moving it. When the forkis turned, the stem of the box to which it has imparted its movement is :retained by the spring-hook 45, fixed on the shaft and which holds it fast in this position; but a finger or driver 46, identical with the one which works the fork, can be caused to act on the hook, so as to release the stem of the box, which will then return to its original position. By arranging the ngers or drivers for working the forks and hooks in a suitable manner on the cylinder-cover the opening and closing of the admission-ports are caused to take place at the desired points of the stroke of the vane in either direction. The exhaust is regulated by identical arrangements provided on the other cylinder-cover and which work a second box arranged in the shaft behind the first. The cavity of the shaft is closed in the middle by a partition, and the boxes are closed at their ends facing this partition.

IIO

Having now fully described my said invention, what I claim, and desire to secure by Letters Patent, is-

l. The combination, in a rotary motor, of a cylinder rotatable in one direction and having axial inlet and exhaust passages at opposite ends communicating through the cylin-` between, forming, alternately, abntnnents for each other, and means to prevent rotation of the cylinder and shaft except in the same direotion.

3. The combination, in a rotary engine, of a rotatable cylinder, and a hollow shaft in the cylinder independently rotatable in the same direction and having` radial ports, a radial partition projecting from the cylinder to contact with the shaft, a radial partition projecting from the shaft to contact with the cylinder, said partitions forming, alternately, a reciprocal abutment and piston and rocking valves in the hollow of the shaft controlling admission and exhaust through the ports.

v In testimony whereof I have hereunto set -Iny hand in the presence of two Witnesses. PAUL ALEXANDRE DUPONT. Witnesses:

E. M. J. DELLEPIANE, A. WATKINS. 

